I remember last year when Trump's course was still sort of a horrifying unknown. A lot of people at the time, including a few here, were quite hopeful for Romney when his name was mentioned as lead candidate for SoS. If nothing else, he was probably the best-qualified (or "least incompetent" if you lean that way), among those listed as actual candidates. So his stock has been rising a bit for a while now. And to his credit, AFAIK, he's pretty notably never endorsed any of Trump's decisions or policies.
I'm fully aware that Romney pulled all kinds of stupid shit in the past, but even though he's still going to be Generic GOP Establishment Guy no matter what, it's also possible that he's actually learned some things in the past five years. Hell, they might even have been positive lessons! It's quite possible that a Romney presidency in 2020 would be a very different affair than what would have been a Romney presidency in 2012. Maybe. But it's enough of a maybe that I'd be prepared to see what he had to say.
Ideally the Democrats will get some actual progressive candidates and run the house on the GOP, but if they screw the pooch and let the GOP have at it again, yeah, Romney would still be a big upgrade over what we have now.
Oh and Romney primarying Trump but losing to a Democrat would also still be an upgrade.